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Chinnaiyah Sripan,Devarajan Alagarasan,S. Varadharajaperumal,R.Ganesan,Ramakanta Naik 한국물리학회 2020 Current Applied Physics Vol.20 No.8
The well-known quaternary Cu2ZnSnS4 (CZTS) chalcogenide thin films are playing an important role in modern technology. The CZTS nanocrystal were successfully prepared by solution method using water, ethylene glycol and ethylenediamine as different solvent. The pure phase material was used for thin film coating by thermal evaporation method. The prepared CZTS thin films were characterized by XRD, Raman spectroscopy, FESEM, XPS and FT-IR spectroscopy. The XRD and Raman spectroscopy analysis revealed the formation of polycrystalline CZTS thin film with tetragonal crystal structure after annealing at 450 °C. The oxidation state of the annealed film was studied by XPS. A direct band gap about 1.36 eV was estimated for the film from FT-IR studies, which is nearly close to the optimum value of band gap energy of CZTS materials for best solar cell efficiency. The CZTS annealed thin films are more suitable for using as a p-type absorber layer in a low-cost solar cell.
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Propose of Fuzzy Logic-Based Students’ Learning Assessment
Rungaroon Sripan,Bandit Suksawat 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper proposes the students’ learning assessment by using fuzzy logic. The framework of practical learning system for computer discipline is also presented to explain a conceptual design of an intelligent tutorial system. The proposed framework composes of six components including interface module, domain knowledge, inference engine, student module, mentor module and pedagogical module. The inference engine performed students’ group classification form on-line pre-test examination before starting the practical worksheet application. Two input parameters consisting of percentage of score and time were established as inputs for membership functions of fuzzy logic system. The twenty-five fuzzy rules were created for the proposed method by experts. The defuzzification of output membership functions, including good, fair and improve were performed by using the centroid method. In this paper, 26 students were tested in order to compare the students’ learning performance, assessed by fuzzy logic and t-score method. The results revealed that the proposed method was a flexible process to classify students’ learning group based on the objectives of subject and the real time performance comparing with t-score method.
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Bongkot Jia-Mahasap(Bongkot Jia-Mahasap ),Chakri Madla(Chakri Madla ),Patumrat Sripan(Patumrat Sripan ),Imjai Chitapanarux(Imjai Chitapanarux ),Ekkasit Tharavichitkul(Ekkasit Tharavichitkul ),Somvilai 대한방사선종양학회 2022 Radiation Oncology Journal Vol.40 No.4
Purpose: Specific radiation delivered to tumors by stereotactic radiosurgery (SRS) has become widely used in the treatment of brain metastasis. This study aimed to compare radiation therapy planning and its parameters from SRS using three different modalities: helical tomotherapy (HT), volumetric modulated arc therapy (VMAT), and cone-based linac radiosurgery (Cone-based). Materials and Methods: Each contouring dataset of patents who experienced one to four brain metastasis received SRS in our center was re-planned to create radiation therapy planning in all three treatment systems (HT, VMAT, and Cone-based). The parameters of conformity index (CI), homogeneity index (HI), CI50, and gradient index (CGI) were analyzed to compare the effects of the three techniques. Decision score analysis was used to evaluate the performance on dosimetric and organs-at-risk parameters among the different techniques by applying the Cone-based technique as a benchmark. Results: A total of 21 patients with 39 lesions were included in this study. The results from the decision score analysis demonstrated statistically identical CI, CI50, and CGI values between Cone-based and VMAT for single lesions. For multiple lesions, VMAT also provided better CI when compared to Cone-based technique while HT exhibited the poorest dosimetric parameters. Moreover, VMAT exhibited the lowest BrainV5Gy value and displayed the shortest beam-on time calculation. Conclusion: We have conducted a comprehensive comparison of SRS planning approaches. The Cone-based technique revealed the highest HI value, while VMAT provided the best estimated beam-on time value. HT displayed a feasible SRS modality for single lesions, but not for multiple lesions.
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Mukta Behera,Ramakanta Naik,C. Sripan,R.Ganesan,N.C.Mishra 한국물리학회 2019 Current Applied Physics Vol.19 No.8
The manuscript reports the effect of Bi content on the linear and nonlinear optical properties as well as the structural and physical properties in thermally evaporated As40Se60-xBix chalcogenide thin films. The optical properties of the as-deposited films have been studied from the optical transmission data recorded by UV–Visible spectrometer. The linear optical parameters (linear refractive index n, extinction coefficient k, absorption coefficient α), indirect optical band gap, Urbach energy, oscillator energy, dispersion energy were calculated from the transmission data which were strongly influenced by Bi content. The dispersion of refractive index was analyzed in terms of single oscillator Wemple-Di Domenico model. The third order nonlinear susceptibility (χ(3)) and nonlinear refractive index (n2) were calculated from the linear parameters using semi-empirical relations. The optical gap decreased which was discussed by chemical bond approach and degree of disorder possessed by the films. The optical properties changes in the films were also well supported by the Raman shift. The structural characterization by X-ray diffraction revealed the amorphous nature of the prepared films whereas the composition and micro structure of the studied films were probed by energy dispersive X-ray analysis and field emission scanning electron microscopy study.
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Effect of Temperature on the Killing of Opisthorchis viverrini Eggs In Vitro
Parichart Boueroy,Kunyarat Duenngai,Chatanun Eamudomkarn,Panupan Sripan,Thidarut Boonmars,Benjamabhorn Pumhirunroj,Atchara Artchayasawat,Jiraporn Songsri,Kanpicha Chomphumee,Panaratana Rattanasuwan,Po 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.1
Contaminated liver fluke egg in the environment has led to the high prevalence of human opisthorchiasis asso- ciated with cholangiocarcinoma in Southeast Asia. To find the effective lessening methods of Opisthorchis viverrini eggs in the contaminated environment, we investigated the temperature conditions for killing of these trematode eggs in vitro. Numerous O. viverrini eggs were obtained in the proximal part of uteri of adult worms from experimental hamsters. Ma- ture eggs with miracidium were allocated by experimental groups (2 control: positive and negative and 4 treatment: 50, 60, 70, and 80°C) with 0.85% saline, and treated by the experimental plan. Eggs in each experimental groups were ob- served under the confocal microscope after stain with Propidium Iodide (PI) to evaluate the effect of temperatures. Eggs in 70 and 80°C groups were all killed after over 10 min heated. Majority of eggs in 60°C (10, 15, and 30 min heated), 70 and 80°C (5 min heated) groups were inactivated. However in 50°C group, below half of eggs were to be killed in all time lapse (10, 15 and 30 min). In order to prevent O. viverrini infection and cholangiocarcinoma, direct treatment of sewage by heating at 70 or 80°C at least 10 min is essential. Therefore, treatment of O. viverrini eggs at a high temperature is a po- tential method for controlling egg contamination in sewage.
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Spatial and Temporal Analyses of Cervical Cancer Patients in Upper Northern Thailand
Thongsak, Natthapat,Chitapanarux, Imjai,Suprasert, Prapaporn,Prasitwattanaseree, Sukon,Bunyatisai, Walaithip,Sripan, Patumrat,Traisathit, Patrinee Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.11
Background: Cervical cancer is a major public health problem worldwide. There have been several studies indicating that risk is associated with geographic location and that the incidence of cervical cancer has changed over time. In Thailand, incidence rates have also been found to be different in each region. Methods: Participants were women living or having lived in upper Northern Thailand and subjected to cervical screening at Maharaj Nakorn Chiang Mai Hospital between January 2010 and December 2014. Generalized additive models with Loess smooth curve fitting were applied to estimate the risk of cervical cancer. For the spatial analysis, Google Maps were employed to find the geographical locations of the participants' addresses. The Quantum Geographic Information System was used to make a map of cervical cancer risk. Two univariate smooths: x equal to the residency duration was used in the temporal analysis of residency duration, and x equal to the calendar year that participants moved to upper Northern Thailand or birth year for participants already living there, were used in the temporal analysis of the earliest year. The spatial-temporal analysis was conducted in the same way as the spatial analysis except that the data were split into overlapping calendar years. Results: In the spatial analysis, the risk of cervical cancer was shown to be highest in the Eastern sector of upper Northern Thailand (p-value <0.001). In the temporal analysis of residency duration, the risk was shown to be steadily increasing (p-value =0.008), and in the temporal analysis of the earliest year, the risk was observed to be steadily decreasing (p-value=0.016). In the spatial-temporal analysis, the risk was stably higher in Chiang Rai and Nan provinces compared to Chiang Mai province. According to the display movement over time, the odds of developing cervical cancer declined in all provinces. Conclusions: The risk of cervical cancer has decreased over time but, in some areas, there is a higher risk than in the major province of Chiang Mai. Therefore, we should promote cervical cancer screening coverage in all areas, especially where access is difficult and/or to women of lower socioeconomic status.
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